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Production method of fiber-reinforced resin

A technology of fiber-reinforced resin and manufacturing method, applied in the field of fiber-reinforced resin, to achieve the effect of reducing surface repair process and low cost

Inactive Publication Date: 2012-06-06
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, since the random mat layer is disposed directly under the surface base material, the air bubbles contained in the resin accumulate in the random mat layer, and pinholes may be generated that penetrate through the surface base material directly above.

Method used

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  • Production method of fiber-reinforced resin
  • Production method of fiber-reinforced resin
  • Production method of fiber-reinforced resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] in having Figure 5 Arranged in the forming lower mold 42 of the cavity 41 of 480mm×480mm in the shape shown Image 6 The shown reinforcing fiber substrates and the like (51a, 51b, 51c, 51d) are sealed with a sealing material 43, and at the same time, an upper mold not shown in the figure is closed. The structure of each base material, such as a reinforcing fiber used here, is as follows.

[0123] Substrate 31a for surface layer formation: Substrate a (0° / 90° fiber orientation)×1Ply

[0124] Substrate 31b of the middle layer: Substrate a (0° / 90° fiber orientation)×1Ply

[0125] Substrate 31c of resin diffusion medium layer: Substrate f×1Ply

[0126] Reinforcing fiber substrate 31d: substrate a (0° / 90° fiber orientation)×2Ply

[0127] use figure 2 The shown apparatus determines the impregnation coefficient of substrate a and substrate f. For the measurement, a liquid whose viscosity at 25° C. was substantially the same as that of resin a at a molding temperature o...

Embodiment 2

[0135] A molded article was obtained in the same manner as in Example 1 except that the structure of each reinforcing fiber base material was as follows.

[0136] Substrate 51a for surface layer formation: Substrate b' (0° / 90° fiber orientation) x 1Ply

[0137] The base material 51b of the intermediate layer: base material c' (0 ° / 90 ° fiber orientation) * 1Ply

[0138] Substrate 51c of resin diffusion medium layer: Substrate f×1Ply

[0139] Reinforcing fiber substrate 51d: substrate c' (0° / 90° fiber orientation) x 2Ply

[0140] The impregnation coefficient of each base material at this time is as follows.

[0141] The impregnation coefficient K of substrate b'=0.66×10 -10 m 2

[0142] The impregnation coefficient of substrate f K=3.1×10 -10 m 2

[0143] The impregnation coefficient K of substrate c'=0.63×10 -10 m 2

[0144] Therefore, the impregnation coefficient ratio at this time is 4.7. The thickness of the obtained molded product was measured with a micrometer...

Embodiment 3

[0147] A molded article was obtained in the same manner as in Example 1 except that the structure of each reinforcing fiber base material was as follows.

[0148] Substrate 51a for surface layer formation: Substrate h (0° / 90° fiber orientation)×1Ply

[0149] Substrate 51b of the middle layer; Substrate b (0° / 90° fiber orientation)×2Ply

[0150] Substrate 51c of resin diffusion medium layer: Substrate g×1Ply

[0151] Reinforcing fiber substrate 51d: substrate b (0° / 90° fiber orientation)×1Ply

[0152] The impregnation coefficient of each base material at this time is as follows.

[0153] Impregnation coefficient K of base material h=0.58×10 -10 m 2

[0154] The impregnation coefficient K of substrate g=2.3×10 -10 m 2

[0155] The impregnation coefficient K of substrate c=0.62×10 -10 m 2

[0156] Therefore, the impregnation coefficient ratio at this time is 4.0. The thickness of the obtained molded product was measured with a micrometer at each of the corners and the...

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Abstract

A process for producing a fiber-reinforced resin which comprises placing at least a reinforcing fibrous base in the cavity of a mold, injecting a resin into the cavity, and curing the resin, characterized in that a substrate for skin layer formation and a resin-diffusing medium in which the proportion of the coefficient of impregnation thereof to that of the substrate for skin layer formation is 1.5-10 are disposed on at least one side of the reinforcing fibrous base through an interlayer comprising at least one woven fabric having a cover factor of 90-100% so that the resin-diffusing medium is located between the substrate for skin layer formation and the reinforcing fibrous base. The process diminishes pin hole generation in the skin layer in RTM, and can reduce the necessity of a repair step in, e.g., a coating step as a later step. It can attain improved productivity.

Description

technical field [0001] The present invention relates to a method for producing fiber-reinforced resin (hereinafter also referred to as FRP (Fiber Reinforced Plastic).), and more particularly to a method for producing fiber-reinforced resin by RTM molding (Resin Transfer Molding). [0002] The RTM molding method of the present invention includes: using a pair of upper and lower double-sided molding molds, injecting resin from the resin injection port to the resin discharge port under pressure, using the resin to squeeze out the air in the mold and then closing the resin discharge port to heat the inside of the mold. The RTM molding method that solidifies the resin; the RTM molding method that vacuumizes the mold and then injects the resin into the mold to make it solidify; Vacuum RTM molding is a vacuum RTM molding method in which the inside is decompressed after bagging, and then the resin is sucked and injected using the internal vacuum pressure. Background technique [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C39/10B29C70/06B29K105/08
CPCB29C70/345B29K2995/0073B29C70/48Y10T428/2971Y10T428/2915B29C70/547B29C39/10B29C39/02D06M17/00
Inventor 关户俊英竹本秀博辻诚司田中慎太郎
Owner TORAY IND INC
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